Officers at the Royal Fleet Auxiliary (RFA) are to take strike action for the first time in the history of the service.
Nautilus International said its members will walk out on August 15 in a long-running pay dispute.
Officers have been taking action short of a strike since June.
Nautilus International director of organising Martyn Gray said “Strike action is always a last resort for us, but there is a palpable strength of feeling among our members at the RFA.
“Over 14 years of cuts and pay restraint, despite the RFA undertaking increasingly complex operations, have taken their toll.
“Our members are overworked, underpaid and undervalued.
“Despite early engagement with the Ministry of Defence post the general election, we are yet to receive a new and improved pay offer for our members. This is unacceptable and leaves us no option but to escalate from action short of strike to full strike action.
“Our message is simple, to avoid disruption at the RFA who are vital to the UK’s naval capabilities, we need a pay offer that reflects the high rate of inflation and a pathway to pay restoration. We remain committed to working with government to achieve that.”
